Instanced housing would do wonders for the health of the game, but I think far too many of the few people SE actually listens to (read: FC ward hogs and alt legions) would rage if their stranglehold on the housing market was threatened even a little bit.

I was hoping that the Island Sanctuaries would be something akin to instanced housing, but instead they released as a nothing burger that was so nothing that I wouldn't be surprised if it started to pull a vacuum.

Having a limited amount of anything perpetual in an MMO pretending to be casual is almost always a bad idea, and leads to the 99% being upset that they'll never get to experience it.